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This is an e-book free to read and share electronically as indicated so by the author. However, you are not allowed to print the whole book, instead you should order it from the publisher.
Copyright Cambridge University Press 2003. On-screen viewing permitted. Printing not permitted. http://www.cambridge.org/0521642981 You can buy this book for 30 pounds or $50. See http://www.inference.phy.cam.ac.uk/mackay/itila/ for links.